War zone

An invasive ant defies the rules of social evolution by conquering California with battles between enormous colonies that act like separate species.

Written byMark W. Moffett
| 4 min read

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Adventures Among Ants: A Global Safari with a Cast of Trillions might be mistaken as a photographic or adventure book, but it tells many stories from the front lines of animal behavior. For example, one of the most ecologically damaging and yet fascinating ants is the Argentine ant, which resembles humans in being a natural born conqueror. A native of floodplains in northern Argentina, the Argentine ant has invaded subtropical habitats worldwide because of its proclivity for stowing aboard ships. In California, Argentine ants have been out battling, out eating, and out reproducing native ants since the species first arrived a century ago.

Several other invasive ant species originate from this same part of Argentina. My book describes how all these ants have so honed their fighting skills against each other in Argentina that whenever any of them are able to escape their homeland, the native ants and many other ...

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